I may have an idea, for the sound at least.

I think this is essentially a way to "simulate" the loud keys of a mechanical keyboard on a silent/quieter keyboard. Most mechanical keyboard users would probably say the "click clack" sounds from their key switches are just a side effect and the real reason they use them is the "feel", but I'd argue that it's the entire sensory experience: the feel and sound, that they (and I) enjoy.

It'd be nice to have some low-latency "click clack" sounds on my MBP using Neovim...